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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Hi everybody<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I have the same problem as Cramer (and Fred after him) while trying to simulate air cooling with type 32.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>See below the last statement of Trace before simulation crashes (no water flow actually).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Has anybody ever solved this issue?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks a lot.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>TRACE* UNIT 2 TYPE 32 AT TIME 5.4845000000000000E+03 ITERATION 0 CALL 3175 ITERATIVE CALL<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> P 7.0000000000000000E+00 4.0000000000000000E+00 1.0000000000000000E+00 2.0000000000000004E-02<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> I 2.5400000000000002E+01 2.0103539503836029E+01 1.0000000000000000E+03 1.0000000000000000E+01 0.0000000000000000E+00<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> O 2.5400000000000002E+01 2.0103539503836029E+01 1.0000000000000000E+03 1.0000000000000000E+01 0.0000000000000000E+00<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> O 0.0000000000000000E+00 0.0000000000000000E+00 0.0000000000000000E+00<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>*** Fatal Error at time : 5484.500000<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> Generated by Unit : 2<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> Generated by Type : 32<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'> Message : Attempted to take the log of a negative number. - Enthalpy (H) is less than or equal to zero<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#404040'>--<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#404040'>Antoine Gautier<br>Solam</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#70B221'>en</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#404040'>+33 6 98 78 56 46<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#404040'>antoine.gautier@solamen.fr</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><pre><span lang=EN-US style='color:black'>From silkworth at transsolar.com Thu Feb 11 15:34:15 2010<o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>From: silkworth at transsolar.com (Cramer Silkworth)<o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>Date: Thu, 11 Feb 2010 16:34:15 -0500<o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>Subject: [TRNSYS-users] type 32 (cooling coil) issue<o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>Message-ID: <4B7477D7.5080307@transsolar.com><o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'><o:p> </o:p></span></pre><pre><span lang=EN-US style='color:black'>Hi All,<o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'><o:p> </o:p></span></pre><pre><span lang=EN-US style='color:black'>I'm having some problems Type 32, the simple cooling coil. It crashes a <o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>little way into the simulation (at hour 607.75) with an error about an <o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>enthalpy <0. However, it's at a time when the coil has airflow but no <o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>water flow (cooling is not required at this timestep). I see in the code <o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>of type 32 that if either flows are 0 (actually, <1e-6) then it should <o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>simply set outputs = inputs and return. Any ideas what's going on?<o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'><o:p> </o:p></span></pre><pre><span lang=EN-US style='color:black'>Thanks,<o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>Cramer<o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>-- <o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>*Cramer Silkworth<o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>212 219 2255 | silkworth at transsolar.com <mailto:silkworth at transsolar.com><o:p></o:p></span></pre><pre><span lang=EN-US style='color:black'>Transsolar Inc. | 134 Spring Street Suite 601 | New York, NY 10012<o:p></o:p></span></pre><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>----- <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>From fbetz at aeieng.com Fri Mar 26 14:43:20 2010<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>From: fbetz at aeieng.com (Fred Betz)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>Date: Fri, 26 Mar 2010 14:43:20 -0500<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>Subject: [TRNSYS-users] CoolingCoil Type32 error<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>Message-ID: <CC53390F16CC5446BFDB4B68CF0DAFA40A86D2AD@AEI-MB.aeieng.lan><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>TRNSYS Users,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>I am getting a strange error: Attempted to take the log of a negative number. -enthalpy (H) is less than or equal to zero.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>This happens right when the simulation starts so only the initial conditions should be taken into consideration as no information has been passed between components yet.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>The air temperatures (dry and wet bulb) are higher than the water temperature and as this is a cooling coil, that would make sense.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>If someone please shed some light on this error I would appreciate it.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>Fred<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Courier New";color:black'>Fred Betz PhD., LEED AP<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";color:black'>Sustainable Systems Analyst<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p></div></body></html>